The biggest changes this week are among our key commodity fallers. Cotton and coconut oil prices have both slumped by 11.4% month on month.

US cotton prices are tumbling on expectation of high global output for the 2014/15 season. In the US, concern about the lower prices of other crops had persuaded farmers to increase production of cotton this year.

Coconut oil prices are falling because of an improving supply picture. Prices of palm kernel oil are also down, due to high stock levels and low demand.

Among the key risers, wheat durum prices are up 5% month on month - though they remain 7.4% down year on year. Prices fell earlier in the year in anticipation of a good harvest, but have risen as supplies decrease before harvest.

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